In general, if you are photographing someone and you think you might want to use the image commercially later, you should try to obtain a model release for the photograph.
true or false

The statement is true.

You need a model release when you want to use the image commercially.

A document that spells out under which conditions a photographer may use a photograph of someone is a model release, and when photograph or image of someone is used commercially it means use for advertising purposes.